<http://webisa.webdatacommons.org/prov/139228292>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/152619544> .
<http://webisa.webdatacommons.org/152619544>	<http://www.w3.org/ns/prov#value>	"Answer: A database system must provide for such features as transactions, queries (associative retrieval of objects), security, and integrity." .
<http://webisa.webdatacommons.org/152619544>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/152619544>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<issuu.com> .